@Laura Blair How common is it for a municipality to allow for a shipping container home or tiny home?

You are at the mercy of comparables with 1-4 unit investing.You can contest an appraisal if there are clear errors (wrong room, bathroom, or square footage counts) or poor comps were used. 

I don't know any good search engines and my agent says it's not common to buy duplexes and triplexes.

If they don’t they will likely be no better or worst than a common lease tenant , but Unfortunately they may less concerned in paying monthly rent as they have both the law and the preparedness of knowing they were going to move , it’s like they have nothing to loose by not paying and than moving when they are ready.

Delayed closings and price reductions are very common over the last 2 weeks.

But what about your ability to do that once should preclude an investor from buying another deal from another agent who found the same type of error and you missed?

Either, way yes this is a very common scenario.

First, there is a reason "Pro" Investors commonly speak of there extensive use of P.M.

Price cuts are becoming more common.

Seriously, on average, he has a closing everyday, commonly two, not to mention all the showings and paperwork but is now just sitting at home.This lack of activity does not appear to have affected prices yet.